Earth Sciences

Deformation and seismicity decline before the 2021 Fagradalsfjall eruption

F. Sigmundsson, M. Parks, et al.

Discover how the 2021 Fagradalsfjall eruption in Iceland was shaped by tectonic stress release and a fascinating decline in seismic activity just days before the volcanic event. Research conducted by Freysteinn Sigmundsson and colleagues sheds light on the complex interplay between volcanoes and tectonic forces, enhancing our understanding of eruption forecasting.

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Abstract

The 2021 Fagradalsfjall eruption in Iceland was preceded by a period of tectonic stress release culminating in a decline in deformation and seismicity days before the eruption. High rates of deformation and seismicity occurred from February 24th to mid-March due to magma dyke emplacement, but these rates decreased as tectonic stress was released. Weaker crust near the surface may have also contributed to reduced seismicity. This highlights the need to consider the interaction between volcanoes and tectonic stress for eruption forecasting.

Publisher

Nature

Published On

Sep 14, 2022

Authors

Freysteinn Sigmundsson, Michelle Parks, Andrew Hooper, Halldór Geirsson, Kristín S. Vogfjörd, Vincent Drouin, Benedikt G. Ófeigsson, Sigrún Hreinsdóttir, Sigurlaug Hjaltadóttir, Kristín Jónsdóttir, Páll Einarsson, Sara Barsotti, Josef Horálek, Thorbjörg Ágústsdóttir

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